WO2009090850A1 - 加熱発泡シート、その製造方法および発泡充填部材 - Google Patents

加熱発泡シート、その製造方法および発泡充填部材 Download PDF

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Publication number
WO2009090850A1
WO2009090850A1 PCT/JP2008/073830 JP2008073830W WO2009090850A1 WO 2009090850 A1 WO2009090850 A1 WO 2009090850A1 JP 2008073830 W JP2008073830 W JP 2008073830W WO 2009090850 A1 WO2009090850 A1 WO 2009090850A1
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Prior art keywords
sheet
heat
extrusion
foam
heated
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PCT/JP2008/073830
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English (en)
French (fr)
Japanese (ja)
Inventor
Yoshiaki Mitsuoka
Takeo Nishioka
Yasuharu Imamura
Osamu Degawa
Kazumasa Asano
Takehiro Ui
Mitsuo Matsumoto
Takahiro Fujii
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Nitto Denko Corporation
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Application filed by Nitto Denko Corporation filed Critical Nitto Denko Corporation
Priority to US12/735,238 priority Critical patent/US20100273903A1/en
Priority to CN200880124295.6A priority patent/CN101909852B/zh
Publication of WO2009090850A1 publication Critical patent/WO2009090850A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0026—Flame proofing or flame retarding agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0032—Pigments, colouring agents or opacifiyng agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0044—Stabilisers, e.g. against oxydation, light or heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers

Definitions

  • the present invention relates to a heat-foamed sheet, a method for producing the same, and a foam-filled member. Specifically, the present invention relates to a heat-foamable sheet suitable for filling the internal space of a hollow member, a method for producing the same, and a foam-filled member.
  • a hollow member formed as a closed cross section of an automobile pillar or the like is filled with a foam to prevent engine vibration and noise or wind noise from being transmitted into the vehicle interior. It has been known.
  • a foam can be obtained by, for example, heating and foaming a foamed sheet obtained by processing after forming into a sheet shape by extrusion molding or calendar molding (for example, the following patent document) 1).
  • a heated foam sheet that stretches in one direction when heated at 100 to 130 ° C. and has an elongation rate of 5 to 50% in the stretch direction is used as a filling foam member. It has been proposed to simply fill a space (see, for example, Patent Document 2 below). JP 2006-151333 A JP 2007-76169 A
  • an object of the present invention is to provide a heated foam sheet that foams uniformly in all directions, a method for producing the heated foam sheet, and a foam filling member including the heated foam sheet.
  • the heat-foamable sheet of the present invention is a heat-foamable sheet formed by extruding a heat-foamable material containing a polymer and a foaming agent and heated at 160 ° C. for 20 minutes.
  • the aspect ratio is 1.5 or less.
  • the heat-foamed sheet of the present invention is characterized by having isotropic properties.
  • the method for producing a heat-foamed sheet of the present invention includes an extruding step of extruding a heat-foaming material containing a polymer and a foaming agent into an isotropic containing shape including an isotropic portion having a substantially arc shape, and extruding in the extruding step. And a sheet forming step of forming the heated foam material into a sheet shape.
  • the heat-foamable material in the extrusion step, is extruded into a cylindrical shape by an extrusion molding machine equipped with a die having an annular discharge outlet.
  • the cylindrical molded product is formed by a cutter disposed so as to overlap a part of the discharge port when projected in the extrusion direction on the downstream side in the extrusion direction of the discharge port. It is preferable to cut continuously in the extrusion direction to obtain a sheet-like molded product.
  • the heat-foamed material is extruded by an extruder equipped with a die having an end having a substantially arc portion at the discharge port, and an extrusion step and a sheet formation step are performed. It is preferable to carry out at the same time. Moreover, in the manufacturing method of the heat-foamed sheet of this invention, it is suitable to convey the heat-foamable material formed in the sheet
  • the foam filling member of the present invention is characterized by comprising the above-mentioned heated foam sheet and a fixing member that is attached to the heated foam sheet and can be fixed in the internal space of the hollow member.
  • the heating foam sheet of the present invention can be uniformly foamed in all directions by attaching the fixing member to the internal space and heating and foaming the heat foam sheet. As a result, the space can be filled uniformly. Moreover, according to the manufacturing method of the heating foam sheet of this invention, the heating foam sheet of this invention can be manufactured easily and efficiently.
  • the heat-foamed sheet of the present invention is formed by forming a heat-foamed material that is foamed by heating into a sheet by extrusion molding.
  • the heat-foaming material contains at least a polymer as a main component and a foaming agent for foaming the polymer.
  • the polymer is not particularly limited.
  • ethylene / vinyl acetate copolymer, polyethylene, polypropylene, polyester, polyvinyl butyral, polyvinyl chloride, polyamide, polyketone, and the like for example, styrene / butadiene rubber (SBR), polybutadiene, etc.
  • SBR styrene / butadiene rubber
  • BR polybutadiene
  • an ethylene / vinyl acetate copolymer is used.
  • the expansion ratio can be increased.
  • these polymers those having a melting point of 60 to 120 ° C., more preferably 80 to 100 ° C. are preferably selected. If the melting point is less than 60 ° C., the polymer itself may become sticky and may be difficult to handle even at room temperature. If it exceeds 120 ° C., it is necessary to increase the processing temperature. May decompose. The melting point is determined by DSC (differential scanning calorimeter).
  • foaming agent examples include inorganic foaming agents and organic foaming agents.
  • examples of the inorganic foaming agent include ammonium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, azides and the like.
  • examples of the organic foaming agent include azo compounds such as azodicarbonamide, barium azodicarboxylate, azobisisobutyronitrile, azodicarboxylic amide, such as N, N′-dinitrosopentamethylenetetramine.
  • N, N′-dimethyl-N, N′-dinitrosotephthalamide, trinitrotrimethyltriamine, and other nitroso compounds such as 4,4′-oxybis (benzenesulfonylhydrazide), paratoluenesulfonylhydrazide, diphenylsulfone- Hydrazide compounds such as 3,3′-disulfonylhydrazide and allylbis (sulfonylhydrazide), for example, semicarbazide compounds such as p-toluylenesulfonyl semicarbazide and 4,4′-oxybis (benzenesulfonyl semicarbazide), for example Trichloromonofluoromethane, fluoride alkanes such dichloro monofluoromethane, for example, triazole compounds such as 5-morpholyl-1,2,3,4-thiatriazole and the like.
  • 4,4′-oxybis benzenesulfon
  • foaming agents those that decompose and generate a gas at a melting point or higher of the polymer and hardly foam when the heated foaming material described later is molded are appropriately selected depending on the composition.
  • those which foam (decompose) at 140 to 180 ° C. are used. More specifically, 4,4′-oxybis (benzenesulfonylhydrazide) is used.
  • These foaming agents can be used by appropriately selecting one kind or two or more kinds.
  • the blending ratio of the foaming agent is not particularly limited, but is, for example, 5 to 50 parts by weight, preferably 10 to 30 parts by weight with respect to 100 parts by weight of the polymer.
  • the blending amount of the foaming agent is a range in which the foaming ratio of the heat-foamable sheet is substantially 5 to 25 times, preferably about 10 to 20 times, and substantially closed cells are generated. Is preferred. If the blending amount of the foaming agent is too small, the heat-foamed sheet will not foam sufficiently. On the other hand, if the blending amount of the foaming agent is too large, voids are generated due to the dripping of the foamed resin, both of which are filled Provoke.
  • a crosslinking agent, a foaming aid, and the like are appropriately added to the heat-foaming material in order to efficiently foam the polymer, and further to crosslink and cure.
  • a crosslinking agent for example, the radical generating agent which decomposes
  • dicumyl peroxide 1,1-ditertiarybutylperoxy-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-ditertiarybutylperoxyhexane, 2 Organic peroxidation such as 1,5-dimethyl-2,5-ditertiarybutylperoxyhexyne, 1,3-bis (t-butylperoxyisopropyl) benzene, tertiarybutylperoxyketone, tertiarybutylperoxybenzoate Such as things.
  • a vulcanizing agent can be used as a crosslinking agent.
  • a vulcanizing agent is not particularly limited.
  • sulfur, sulfur compounds, selenium, magnesium oxide, lead monoxide, zinc oxide, polyamines, oximes, nitroso compounds, resins, ammonium salts, etc. Is mentioned.
  • These crosslinking agents can be used by appropriately selecting one kind or two or more kinds.
  • the blending ratio of the crosslinking agent is not particularly limited, but is, for example, 0.1 to 10 parts by weight, preferably 0.5 to 7 parts by weight with respect to 100 parts by weight of the polymer.
  • a vulcanization accelerator can be used in combination.
  • the vulcanization accelerator include vulcanization accelerators such as dithiocarbamic acids, thiazoles, guanidines, sulfenamides, thiurams, xanthogenic acids, aldehyde ammonias, aldehyde amines and thioureas.
  • vulcanization accelerators such as dithiocarbamic acids, thiazoles, guanidines, sulfenamides, thiurams, xanthogenic acids, aldehyde ammonias, aldehyde amines and thioureas.
  • One or more of these vulcanization accelerators can be appropriately selected and used, and the blending ratio is 0.1 to 5 parts by weight with respect to 100 parts by weight of the polymer.
  • a known vulcanization retarder such as an organic acid or an amine can be appropriately blended.
  • a foaming adjuvant for example, a well-known foaming adjuvant can be selected suitably,
  • the urea type compound which has urea as a main component for example examples thereof include metal oxides such as zinc oxide and lead oxide, higher fatty acids such as salicylic acid and stearic acid, and metal salts thereof.
  • higher fatty acid metal salts are used.
  • foaming auxiliaries can be used by appropriately selecting one kind or two or more kinds.
  • the blending ratio of the foaming aid is not particularly limited, but is, for example, 1 to 20 parts by weight, preferably 5 to 10 parts by weight with respect to 100 parts by weight of the polymer.
  • the heat-foamable material may have, for example, a stabilizer, a reinforcing material, a filler, a softener, a lubricant, and, if necessary, within a range that does not affect the physical properties of the obtained foam depending on the purpose and application.
  • known additives such as plasticizers, antioxidants, antioxidants, pigments, colorants, fungicides, and flame retardants can be appropriately blended.
  • the heat-foaming material is prepared by, for example, kneading, for example, using a mixing roll or a pressure kneader after blending the above-described components in the blending ratio described above.
  • the method for kneading the heated foam material is not particularly limited, and an existing kneader or the like can be used as appropriate.
  • the heat-foamed material is preferably prepared with a viscosity of 100 to 10,000 Pa ⁇ s (100 ° C.).
  • FIG. 1 shows the schematic block diagram of one Embodiment of the extruder for shape
  • an extrusion molding machine 1 is disposed at a power unit 2, a hopper 3 disposed above the power unit 2, a cylinder 4 disposed on the side of the power unit 2, and a tip of the cylinder 4. And a die 5.
  • the power unit 2 usually includes a speed reducer, a motor, and the like. In the power unit 2, the rotational speed of the motor is controlled by a speed reducer, and a driving force is applied to a screw described later.
  • the hopper 3 has a funnel-like shape, and a heated foam material is introduced.
  • the cylinder 4 has a cylindrical shape extending in the horizontal direction, and is provided with a screw therein although not shown.
  • the screw may be one (single axis) or two (biaxial).
  • the die 5 is provided at the downstream end of the cylinder 4 in the extrusion direction. As shown in FIG. 2A, the die 5 is formed with a discharge port 6 for forming the heat foam material into a predetermined shape.
  • the discharge port 6 is formed in an annular shape (ring shape). Specifically, its inner diameter ID is, for example, 30 to 150 mm, and its outer diameter OD is, for example, 31 to 155 mm.
  • the gap (interval between the inner diameter and the outer diameter) S is formed in an annular shape of 1 to 5 mm, for example.
  • a cutter 7 and a conveyor 8 are provided on the downstream side in the extrusion direction of the extrusion molding machine 1 (hereinafter simply referred to as the downstream side), specifically, on the downstream side of the die 5.
  • the cutting edge of the cutter 7 is disposed on the downstream side of the discharge port 6 so as to overlap with the discharge port 6 so as to cross a part of the discharge port 6 in the diameter direction when projected in the extrusion direction.
  • the cutting edge of the cutter 7 is arranged so as to overlap with any one of the upper end portion, the lower end portion and the side end portion (the upper end portion in FIG. 1) of the discharge port 6 when projected in the extrusion direction. Yes.
  • the conveyor 8 includes a driving roller 9, a driven roller 10 and an endless belt 11.
  • the drive roller 9 is disposed between the die 5 and the cutter 7 and below the die 5 in the extrusion direction.
  • the driven roller 10 is disposed on the downstream side of the driving roller 9 in the horizontal direction.
  • the endless belt 11 is wound between the driving roller 9 and the driven roller 10.
  • the driven roller 10 is driven by the driving roller 9, and the endless belt 11 moves between the driving roller 9 and the driven roller 10. Specifically, the upper surface of the endless belt 11 moves from the upstream side in the extrusion direction toward the downstream side.
  • the heated foam material is put into the hopper 3.
  • the heated foamed material charged into the hopper 3 is heated by the cylinder 4 and melted and kneaded by the screw while being extruded into a cylindrical shape from the discharge port 6 of the die 5 and molded as a cylindrical molded product 12 (extrusion process). .
  • the temperature of the cylinder 4 is, for example, 40 to 110 ° C., preferably 60 to 100 ° C.
  • the temperature of the die 5 is, for example, 60 to 110 ° C., preferably 80 to 100 ° C.
  • the extrusion rate of the heat-foaming material is, for example, 0.5 to 2.0 m / min, preferably 0.7 to 1.7 m / min.
  • the extruded cylindrical molded product 12 is received by the endless belt 11 of the conveyor 8, and the upper end portion is continuously cut in the extrusion direction by the cutter 7 while being conveyed by the endless belt 11.
  • the cylindrical molded product 12 is symmetrically formed by cutting the upper end portion of the annular cross section so as not to extend from the upper end portion in the circumferential direction (so as to have isotropicity in the width direction). It is opened and formed as a sheet-like molded product 13 (sheet forming step).
  • the conveying speed of the conveyor 8 is, for example, 0.5 to 2.0 m / min, preferably 0.7 to 1.7 m / min. Further, the conveying speed of the conveyor 8 is set to be substantially equal to the extrusion speed.
  • the heat-foamed sheet 14 can be obtained as the sheet-like molded product 13. That is, the heated foam sheet 14 is first extruded from the annular discharge port 6 that is an isotropic portion, and is formed as a cylindrical molded product 12 that is isotropic in the longitudinal direction. Next, the heat-foamed sheet 14 is formed as a sheet-shaped molded product 13 in which the cylindrical molded product 12 is formed into a sheet shape by the cutter 7 and is isotropic in the circumferential direction (the width direction in the sheet shape).
  • the obtained heat-foamed sheet 14 is isotropic in all directions, and the change in the aspect ratio is reduced even when heat-foamed (that is, the heat-foamed sheet 14 has a substantially similar shape in its horizontal plane.
  • the aspect ratio when heated at 160 ° C. for 20 minutes is 1.5 or less, preferably 1.35 or less, and more preferably 1.15 or less.
  • the heating foam sheet 14 which has isotropic property can be manufactured simply and efficiently.
  • the aspect ratio exceeds 1.5, it is necessary to consider the directionality when punching into the final shape, and the production efficiency is lowered.
  • the aspect ratio is measured according to the following procedure. First, the heat-foamed sheet 14 is cut into a substantially rectangular shape to form a test piece, and the length (La) of one side of the test piece (referred to as a side, hereinafter the same) and the other side (b side) The same shall apply hereinafter) (Lb).
  • the test piece is heated at 160 ° C. for 20 minutes, and the length of the side a after heating (La ′) and the length of the side b after heating (Lb ′) are measured.
  • extension rate of a side and b side is calculated by following Formula.
  • the aspect ratio is calculated by comparing the expansion ratio of the a side with the expansion ratio of the b side and dividing the expansion ratio with a large value by the expansion ratio with a small value. That is, when the expansion rate of side a is larger than the expansion rate of side b, the aspect ratio is calculated by the following equation.
  • Aspect ratio (La ′ / La) / (Lb ′ / Lb)
  • an aspect ratio can be simply calculated by cutting out a test piece into square shape (for example, 50 mm x 50 mm).
  • the thickness of the heat-foamed sheet 14 is, for example, 1 to 5 mm, preferably 2 to 4 mm.
  • the conveying speed of the conveyor 8 is substantially equal to the extrusion speed of the extruder 1. Therefore, even when formed from the cylindrical molded product 12 to the sheet-shaped molded product 13, they are not loaded with the stretching force or the compressive force in the extrusion direction, and as a result, the isotropic property can be improved. Moreover, in said method, although the extrusion process and the sheet formation process were implemented sequentially, these extrusion processes and a sheet formation process can also be implemented simultaneously.
  • the discharge port 6 shown in FIG. 2B is provided with a discontinuous portion 15 that crosses in the diameter direction at the upper end of the annular shape.
  • the discharge port 6 is formed as a circular arc part 16 with ends that is partitioned by the discontinuous part 15.
  • the circumferential length L of the discontinuous portion 15 is, for example, 0.5 to 10 mm, preferably 1 to 3 mm. Then, if the heat-foaming material is extruded by the extrusion molding machine 1 equipped with the die 5 shown in FIG. 2B, the heat-foaming material continues from the arc portion 16 that is an isotropic portion of the discharge port 6. While being extruded, the discontinuous portion 15 prevents the heated foam material from being extruded. Therefore, the heated foam material is opened symmetrically from the discontinuous portion 15 and directly molded into a sheet shape.
  • the obtained heat-foamable sheet 14 is isotropic in all directions as described above. Specifically, the aspect ratio when heated at 160 ° C. for 20 minutes is 1.5 or less, preferably 1.35 or less, more preferably 1.15 or less.
  • the extrusion machine 1 is equipped with a die 5 in which a horseshoe-shaped (substantially U-shaped) discharge port 6 shown in FIG. 2C is formed. You can also. That is, the discharge port 6 shown in FIG. 2 (c) has a semicircular arc portion 17 that opens upward, and a linear portion 18 that extends linearly upward from both ends and has an upper end. It has.
  • the semicircular arc portion 17 of the discharge port 6 shown in FIG. 2C is formed in the same size as the corresponding portion of the discharge port 6 shown in FIG. And if a heating foam material is extrusion-molded with the extrusion machine 1 equipped with the die
  • the obtained heat-foamed sheet 14 is isotropic in all directions at the portion extruded from the semicircular arc portion 17, and specifically, the aspect ratio when heated at 160 ° C. for 20 minutes is 1 .5 or less, preferably 1.35 or less, and more preferably 1.15 or less.
  • the portion extruded from the straight portion 18 is anisotropic compared to the semicircular arc portion 17 because the flow of the heated foam material is partially different.
  • the aspect ratio in this case is 1.5 or less, and can be used as the heated foam sheet of the present invention.
  • the heated foam sheet 14 obtained by the above method is isotropic as described above. Therefore, when heated under appropriate conditions, the foamed sheet 14 is uniformly foamed in all directions to uniformly fill the space. be able to.
  • the foam formed by foaming has a density (foam weight (g) / foam volume (cm 3 )) of, for example, 0.03 to 0.3 g / cm 3 , preferably 0 0.05 to 0.1 g / cm 3 , and the volume expansion ratio during foaming is 3 times or more, preferably 10 to 20 times.
  • the heating foam sheet 14 can be foamed in all directions and can uniformly fill the space, it is not particularly limited, for the purposes of vibration control, soundproofing, dustproofing, heat insulation, buffering, watertightness, etc. Used as a filler for various industrial products, for example, as an anti-vibration material, a soundproof material, a dustproof material, a heat insulating material, a shock-absorbing material, a water-stopping material, etc. it can.
  • a fixing member is attached to the heated foam sheet 14 to produce the foam filling member, and the fixing member of the foam filling member is used as the hollow member.
  • the foam is formed by heating and then foamed by heating, the internal space of the hollow member can be uniformly filled with the foam.
  • a pillar of an automobile can be exemplified.
  • a foam filling member is prepared from the heated foam sheet 14 and attached to the interior space of the pillar, and then foamed, the pillar is formed by the foam. It is possible to effectively prevent the vibration and noise of the engine or wind noise from being transmitted to the vehicle interior while sufficiently reinforcing the above.
  • FIG. 3 shows a process diagram of an embodiment of a method for filling an interior space of a pillar using a foam filling member.
  • a method of filling the internal space of the pillar 23 by heating and foaming the foam filling member 20 including the heated foam sheet 14 will be described with reference to FIG.
  • the foam filling member 20 includes a heat foam sheet 14 and a clip 19 that is attached to the heat foam sheet 14 and that is fixed to the internal space of the pillar 23 as a hollow member. ing.
  • the clip 19 is made of hard resin and is formed by injection molding or the like.
  • the foam filling member 20 is produced by fitting the clip 19 into the heated foam sheet 14 cut into an appropriate shape by punching or the like corresponding to the hollow space of the pillar 23.
  • the pillar 23 includes an inner panel 22 and an outer panel 21 having a substantially concave cross section.
  • the foam filling member 20 is first installed on the inner panel 22. Then, both end portions of the inner panel 22 and the outer panel 21 are brought into contact with each other and joined by welding. Thereby, the pillar 23 is formed as a closed cross section. More specifically, such a pillar 23 is used as a front pillar, a side pillar, or a rear pillar of a vehicle body.
  • the heated foamed sheet 14 Foam is uniformly foamed in all directions to form the foam 24, and the internal space of the pillar 23 is uniformly filled by the foam 24 without a gap.
  • the heated foamed sheet 14 is extended in all directions by heating, and therefore can be filled easily and at low cost without a gap.
  • the foam filling member 20 includes the heated foam sheet 14 and the clip 19.
  • the foam filling member 20 of the present invention is not limited to this, for example, the clip 19 is not attached. Alternatively, it may be formed only from the heated foam sheet 14.
  • Example 1 As a polymer, 100 parts by weight of ethylene / vinyl acetate copolymer (Evaflex EV460, melting point 84 ° C., MFR 2.5, vinyl acetate content 19%, manufactured by Mitsui DuPont Polychemical) was used at 90 ° C. using a pressure kneader. The mixture was kneaded for 5 minutes at 20 rpm.
  • ethylene / vinyl acetate copolymer (Evaflex EV460, melting point 84 ° C., MFR 2.5, vinyl acetate content 19%, manufactured by Mitsui DuPont Polychemical) was used at 90 ° C. using a pressure kneader. The mixture was kneaded for 5 minutes at 20 rpm.
  • an extrusion molding machine 1 equipped with a die 5 in which an annular discharge port 6 (inner diameter ID 48 mm, outer diameter OD 50 mm, gap S2 mm) shown in FIG.
  • the heated foamed sheet 14 having a thickness of 2 mm was produced by extrusion molding under the molding conditions shown in No. 1 and then continuously cutting with the cutter 7.
  • Examples 2 to 4, Comparative Example 1 A heat-foamed sheet 14 was produced in the same manner as in Example 1 except that the molding conditions were those shown in Table 1.
  • Comparative Example 2 In place of the die 5 shown in FIG. 2 (a), as shown in FIG. 4, an extrusion molding machine 1 equipped with a T-die 25 having a rectangular flat discharge port formed under the molding conditions shown in Table 1. A heat-foamed sheet 14 was produced in the same manner as in Example 1 except that it was molded. Comparative Example 3 Instead of the extrusion molding machine 1 shown in FIG. 1, except that the calender roll apparatus shown in FIG. Produced a heated foam sheet 14 in the same manner as in Example 1.
  • the heated foam material 31 is introduced from above the nip portion of the first calendar roll 26 and the second calendar roll 27.
  • the heated foam material 31 is rolled between the first calender roll 26 and the second calender roll 27, transferred to the surface of the second calender roll 27, and further between the second calender roll 27 and the third calender roll 28.
  • the heated foam material 31 was taken from the fourth calendar roll 29 to the take-up roll 30 as the heated foam sheet 14.
  • the heated foam sheet and foam filling member of the present invention produced by the production method of the present invention can be used as a filler for various industrial products.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Body Structure For Vehicles (AREA)
PCT/JP2008/073830 2008-01-16 2008-12-26 加熱発泡シート、その製造方法および発泡充填部材 WO2009090850A1 (ja)

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US12/735,238 US20100273903A1 (en) 2008-01-16 2008-12-26 Heat-foamable sheet, producing method therefor, and foam filling member
CN200880124295.6A CN101909852B (zh) 2008-01-16 2008-12-26 加热发泡片材、其制造方法及发泡填充部件

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JP2008007232A JP4421654B2 (ja) 2008-01-16 2008-01-16 加熱発泡シートの製造方法
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CN102431142B (zh) * 2011-12-14 2014-09-10 浙江百纳橡塑设备有限公司 挤出机出料端结构
RU2498900C1 (ru) * 2012-07-13 2013-11-20 Лев Анатольевич Губенко Способ формования длинномерных листов из пластифицированных материалов и устройство для его осуществления
JP7117829B2 (ja) * 2017-07-03 2022-08-15 株式会社ジェイエスピー オレフィン系熱可塑性エラストマー発泡粒子
JP7313966B2 (ja) * 2019-08-09 2023-07-25 日東電工株式会社 押出成形用ダイおよび押出成形用ダイの設計方法

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US20100273903A1 (en) 2010-10-28
CN101909852A (zh) 2010-12-08
CN101909852B (zh) 2014-01-29
CN102806647A (zh) 2012-12-05
JP4421654B2 (ja) 2010-02-24
JP2009166365A (ja) 2009-07-30
CN102806647B (zh) 2016-01-20

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